Package org.apache.hadoop.hbase.io.hfile

Class NanoTimer

java.lang.Object
org.apache.hadoop.hbase.io.hfile.NanoTimer
public class NanoTimer extends Object
A nano-second timer.

Copied from hadoop-3315 tfile. Remove after tfile is committed and use the tfile version of this class instead.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private long
    cumulate
     
    private long
    last
     
    private boolean
    started
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    NanoTimer(boolean start)
    Constructor Start the timer upon construction.

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    isStarted()
    Checking whether the timer is started
    static void
    main(String[] args)
    Simple tester.
    static String
    nanoTimeToString(long t)
    A utility method to format a time duration in nano seconds into a human understandable stirng.
    long
    read()
    Read the timer.
    private boolean
    readable()
     
    void
    reset()
    Reset the timer.
    void
    start()
    Start the timer.
    void
    stop()
    Stop the timer.
    String
    toString()
    Format the elapsed time to a human understandable string.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Field Details

  • Constructor Details

    • NanoTimer

      public NanoTimer(boolean start)
      Constructor Start the timer upon construction.

  • Method Details

    • start

      public void start()
      Start the timer. Note: No effect if timer is already started.

    • stop

      public void stop()
      Stop the timer. Note: No effect if timer is already stopped.

    • read

      public long read()
      Read the timer.
      Returns:
      the elapsed time in nano-seconds. Note: If the timer is never started before, -1 is returned.

    • reset

      public void reset()
      Reset the timer.

    • isStarted

      public boolean isStarted()
      Checking whether the timer is started
      Returns:
      true if timer is started.

    • toString

      public String toString()
      Format the elapsed time to a human understandable string. Note: If timer is never started, "ERR" will be returned.
      Overrides:
      toString in class Object

    • nanoTimeToString

      public static String nanoTimeToString(long t)
      A utility method to format a time duration in nano seconds into a human understandable stirng. Time duration in nano seconds.
      Returns:
      String representation.

    • readable

      private boolean readable()

    • main

      public static void main(String[] args)
      Simple tester.